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SteamOS CONSOLE: the BEST gaming experience, but not worth it
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The gamescope options for the Deck are surely nice, but on a powerful desktop setup, most of them would be more of a gimmick (with some exceptions). And at that point, if you already have a working & desktop, then it's probably easier to route that thing to the TV somehow instead.
I use Nobara for a console setup like this and it works great. Boots straight into gamescope, feels just like the steam deck itself.
A community for gaming on the GNU/Linux distros.